Let's suppose a mobile app aiming to show "all" items, "my" items, and create some items.
The important thing is that an item I create should appear to both "All" and "My".
When I click on "AllItems" tab:
When I click on "MyItems" tab (note the repeated "My Item One"):
When I click on "Create", in order to create an item:
Where should I redirect the user after the creation? The main interest of creating an item is to make it public to any users.
Edit is also concerned in the OP since any show/detail page can contain an "edit" button aiming to update "my" item.